Add more data to dns-check.jsp

Description

The dns-check.jsp page evaluates the DNS records used for the XMPP domain, and suggests what records to use.

This information should be modified to use the TCP port number that's configured (rather than use a hardcoded value), and should include records for XMPP-over-TLS when appropriate (see https://xmpp.org/extensions/xep-0368.html)

Environment

None
Fixed

Assignee

Guus der Kinderen

Reporter

Guus der Kinderen